Buy against your most expensive failure, not against the category with the best-known names. If launches slip and documentation is late, the constraint is product definition, so PLM first. If you're running out of raw materials, holding dead stock or can't cost a batch, the constraint is transactional, so ERP first. If retailers are rejecting listings, PIM is a genuine but much smaller purchase.

The common mistake is buying ERP for a PLM problem because ERP has the bigger budget line and the louder vendors. You then own an excellent transaction system and the same launch delays.

Because both systems hold a version of the product and each is authoritative for a different audience. The lab's formula and the plant's bill of materials describe the same thing until a raw material is substituted, at which point they describe two different products and nothing complains.

Every integration project between them is an attempt to keep two truths in agreement, and the reconciliation cost is permanent rather than one-off. It's the strongest argument for holding both on one record, which is what what is Worldover sets out.

Nowhere, in the standard three-category picture, which is why substance businesses end up with a fourth system. Dossiers, classifications, notifications and safety documents belong to the product definition, so in principle they're PLM. Most PLM platforms grew up around engineered parts and can't represent a substance, so they can't do it.

That's the gap the compliance tools fill, and the reason so many operations run PLM, ERP and a regulatory platform that all disagree. See the regulatory compliance software guide for how that category behaves.